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Finding the Fourth Proportional to 94.71, 142.20 and 64.47

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Solution

The fourth proportional to 94.71, 142.20 and 64.47 is: 96.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.71 : 142.20 = 64.47 : x
  2. Step 2: Convert to fraction form
    94.71/142.20 = 64.47/x
  3. Step 3: Cross multiply
    94.71x = 142.20 × 64.47
  4. Step 4: Simplify right side
    94.71x = 9,167.63
  5. Step 5: Solve for x
    x = 9,167.63/94.71
  6. Step 6: Final answer
    x = 96.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.